SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a435ef30238ab4d7ff2b0e74d79c6fa339c57f65b289dc7484a6835476bc8b95' 
  AND token = 'JYie1OqiQQ7YjGPr5ODAVFTLxOzSUl5XN3mjFTJXp1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}